01.Configuring the Laravel environment
	app/bootstrap/start.php
	$env = $app->detectEnvironment(array(
		'local' => array('computername'),
		'dev' => array('http://dev.example.com'),
		'live' => array('http://example.com'),
	));
	
	You can also detect which environment you are in your code using the following line of code:
	$environment = App::environment();
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02.Configuring the application
	app/config/app.php
	'key' is used by Laravel 4 to encrypt things such as passwords and cookies. 
	You can generate it via the artisan command
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03.Maintenance mode
	One of the new features of Laravel 4 is that we can now switch on or off the maintenance mode. 
	To enable the maintenance mode, simply execute the down artisan command as follows:
	$ php artisan down
	To disable the maintenance mode, use the up command as follows:
	$ php artisan up
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04.